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image

Implemented By

image

Description

This interface is used for handling big data images. read() and write access a block of data at a time. Iteration over all pages can be done with for_all_spages(). The iteration stops when f() returns non-zero, and the return value from for_all_spages() is the last return value from the callback function.

typedef uint64 vdisk_addr_t;

typedef struct image_interface {
        void (*read)(conf_object_t *img, void *to_buf, vdisk_addr_t start,
                     size_t length);
        void (*write)(conf_object_t *img, void *from_buf, vdisk_addr_t start,
                      size_t length);
        int (*for_all_spages)(conf_object_t *img,
                              int (*f)(image_spage_t *, vdisk_addr_t, void *),
                              void *arg);
        void (*set_persistent)(conf_object_t *obj);
        void (*save_to_file)(conf_object_t *NOTNULL obj,
                             const char *NOTNULL file,
                             uint64 start, uint64 length);
        void (*save_diff)(conf_object_t *NOTNULL obj,
                          const char *NOTNULL file);
        void (*clear_range)(conf_object_t *NOTNULL obj,
                            uint64 start, uint64 length);
} image_interface_t;

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